Merge branch 'siocghwtstamp' of git://git.kernel.org/pub/scm/linux/kernel/git/bwh...

[linux-drm-fsl-dcu.git] / net / socket.c

diff --git a/net/socket.c b/net/socket.c
index 1a548b70ef3ad3681b93316d34ac35b51710e97d..cd38a785f7d2bb7e14f86df38b964e39266e605b 100644 (file)
--- a/net/socket.c
+++ b/net/socket.c
@@ -221,12 +221,13 @@ static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
        int err;
        int len;
 
+       BUG_ON(klen > sizeof(struct sockaddr_storage));
        err = get_user(len, ulen);
        if (err)
                return err;
        if (len > klen)
                len = klen;
-       if (len < 0 || len > sizeof(struct sockaddr_storage))
+       if (len < 0)
                return -EINVAL;
        if (len) {
                if (audit_sockaddr(klen, kaddr))
@@ -1840,8 +1841,10 @@ SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
        msg.msg_iov = &iov;
        iov.iov_len = size;
        iov.iov_base = ubuf;
-       msg.msg_name = (struct sockaddr *)&address;
-       msg.msg_namelen = sizeof(address);
+       /* Save some cycles and don't copy the address if not needed */
+       msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
+       /* We assume all kernel code knows the size of sockaddr_storage */
+       msg.msg_namelen = 0;
        if (sock->file->f_flags & O_NONBLOCK)
                flags |= MSG_DONTWAIT;
        err = sock_recvmsg(sock, &msg, size, flags);
@@ -1970,7 +1973,7 @@ static int copy_msghdr_from_user(struct msghdr *kmsg,
        if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
                return -EFAULT;
        if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
-               return -EINVAL;
+               kmsg->msg_namelen = sizeof(struct sockaddr_storage);
        return 0;
 }
 
@@ -2221,16 +2224,14 @@ static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
                        goto out;
        }
 
-       /*
-        *      Save the user-mode address (verify_iovec will change the
-        *      kernel msghdr to use the kernel address space)
+       /* Save the user-mode address (verify_iovec will change the
+        * kernel msghdr to use the kernel address space)
         */
-
        uaddr = (__force void __user *)msg_sys->msg_name;
        uaddr_len = COMPAT_NAMELEN(msg);
-       if (MSG_CMSG_COMPAT & flags) {
+       if (MSG_CMSG_COMPAT & flags)
                err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
-       } else
+       else
                err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
        if (err < 0)
                goto out_freeiov;
@@ -2239,6 +2240,9 @@ static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
        cmsg_ptr = (unsigned long)msg_sys->msg_control;
        msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
 
+       /* We assume all kernel code knows the size of sockaddr_storage */
+       msg_sys->msg_namelen = 0;
+
        if (sock->file->f_flags & O_NONBLOCK)
                flags |= MSG_DONTWAIT;
        err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,